BACKGROUD: I've been having a horrible vibration issue at about 1k on my LNF Solstice GXP. As the car warms up "sometimes" the vibration goes away, other times it doesn't. My question is this. Last year my car would calll for an AFR of 29.4 and get 29.4 This summer, it has somehow "adjusted" itself and is now calling for 27.58 and getting 27.58 at DFCO. Could this be related to my vibration? Is there something that I can look for in the tune?

NOTE: O2 sensor levels look normal.